2008-1-1 Stibnite (Sb2S3) occurs in nature accompanied by quartz (SiO2), pyrite (FeS2) and wurtzite (ZnS). This paper describes the behavior of antimony and some minor accompanying elements (Hg, Fe, Zn, Cu
احصل على السعر
2009-7-22 3.1 Stibnite leaching in NaOH solution Effect of NaOH concentration in leaching solution on leaching solid sample fraction 0.25mm 0.5 mm was studied at 298 K. The duration of leaching was 0 180 min. Samples of leaching solution taken
احصل على السعر
2012-2-1 The kinetics of the reaction between particulate stibnite and mixed Na 2 S + NaOH solutions were studied. The effects of the concentration of the Na 2 S and NaOH (from 0.5% to 2.0%), temperature (from 292 K to 327 K) and particle size (from 40 μm to 500 μm) were investigated. The results are presented in terms of the shrinking (non-reacted) core model and
احصل على السعر
2011-11-11 The kinetics of the reaction between particulate stibnite and mixed Na 2 S + NaOH solutions were studied. The effects of the concentration of the Na 2 S and NaOH (from 0.5% to 2.0%), temperature
احصل على السعر
2011-11-11 The raw material can be ore or concentrate. Leaching can be carried out either in alkaline (Na2S+NaOH; NaOH) or acid (HCl; H2SO4; HF) solutions. In order to achieve good antimony recovery it is essential to leach the raw material under optimum conditions.Kinetics of the reaction between particulate stibnite and mixed Na2S + NaOH solutions were
احصل على السعر
2012-2-1 Stibnite (Sb2S3) Solubility in Sodium Sulfide Solutions. Stibnite solubility increases at an increasing rate with rising Na2S concentration, and the reaction that best fits the experimental data is 2Sb2S3 + HS- + OH-= Sb4S72- + H2O, for which an equilibrium constant was estimated to be about 5.0.
احصل على السعر
2009-7-8 alkaline leaching: NaOH concentration, temperature of leaching and grain size of solid phase was the focus of this research. The apparent activation energy and apparent order of stibnite reaction with the solution that contained NaOH were determined from experiments as Ea ≈ 50.7 kJ mol-1 and n ≈ 1, respectively.
احصل على السعر
2021-1-13 Vegilo et al.16 have previously used response surface methodology (RSM) for designing experiments, and as a modeling and optimizing tool, to determine the optimal condition for the dissolution of Sb. Their results indicated that using 1 g Na 2 S and 1 g NaOH per g of pure stibnite can provide an antimony leaching efficiency up to 98–100%. Ubaldini et al.17
احصل على السعر
2020-7-27 The experiments were carried out separately using stibnite concentrates of 5 g in 250-mL alkaline solutions of different hydroxide ions for 1 h at 100 rpm and 25 °C. In addition to NaOH and KOH, Ba (OH) 2 and NH 4 OH were evaluated for the effect of hydroxide type on Sb extraction from the stibnite concentrate.
احصل على السعر
NaOH (pH= 13.1) solution was 50.8 %, whereas in 2 wt.% NaOH ( pH=13.3) solution it was much higher, reaching 74.2% after 90 minutes of leaching which is
احصل على السعر
2009-10-15 This research focused on establishing the effect of the following parameters on alkaline leaching: NaOH concentration, temperature of leaching, and grain size of solid phase. The apparent activation energy and apparent order of stibnite reaction with the solution that contained NaOH were determined from experiments as Ea ≈ 50.7 kJ mol−1 and
احصل على السعر
It was observed that the rate of leaching of stibnite: a) increased with an increase in both Na^sub 2^S and NaOH concentration (from 0.5 wt. % to 2.0 wt. %), and temperature (from 292 K to 327 K); b) reached its maximum at Na^sub 2^S:NaOH molar ratio equal to 1:2; c) decreased with an increase in particle size (from 0.04 mm to 0.5 mm) and L/S
احصل على السعر
2011-11-11 The raw material can be ore or concentrate. Leaching can be carried out either in alkaline (Na2S+NaOH; NaOH) or acid (HCl; H2SO4; HF) solutions. In order to achieve good antimony recovery it is essential to leach the raw material under optimum conditions.Kinetics of the reaction between particulate stibnite and mixed Na2S + NaOH solutions were
احصل على السعر
2012-2-1 Stibnite (Sb2S3) Solubility in Sodium Sulfide Solutions. Stibnite solubility increases at an increasing rate with rising Na2S concentration, and the reaction that best fits the experimental data is 2Sb2S3 + HS- + OH-= Sb4S72- + H2O, for which an equilibrium constant was estimated to be about 5.0.
احصل على السعر
2009-7-8 alkaline leaching: NaOH concentration, temperature of leaching and grain size of solid phase was the focus of this research. The apparent activation energy and apparent order of stibnite reaction with the solution that contained NaOH were determined from experiments as Ea ≈ 50.7 kJ mol-1 and n ≈ 1, respectively.
احصل على السعر
2010-2-4 2% NaOH solution. Fig.3 shows the antimony recovery at 323K in 1% NaOH solution. Fig. 2 and 3 indicate positive affect of the decreasing particle size of stibnite on antimony recovery. 3.3 Effect of temperature . Positive effect of increasing temperature of leaching on antimony recovery is shown in Fig.4 where leaching in 1% NaOH solution was
احصل على السعر
2012-1-11 LEACHING OFSTIBNITEBYMIXEDNa 2SANDNaOHSOLUTIONS 1. UTECHNICAL NIVERSITY OF KOŠICE, FACULTY F METALLURGY, LETNÁ 9, 042 00 KOŠICE SLOVAKIA ABSTRACT: Kinetics of the reaction between particulate stibnite and mixed Na2S + NaOH solutions were studied. The effects
احصل على السعر
2020-7-27 The experiments were carried out separately using stibnite concentrates of 5 g in 250-mL alkaline solutions of different hydroxide ions for 1 h at 100 rpm and 25 °C. In addition to NaOH and KOH, Ba (OH) 2 and NH 4 OH were evaluated for the effect of hydroxide type on Sb extraction from the stibnite concentrate.
احصل على السعر
2014-10-1 Vegliò and Ubaldini (2001) studied the optimization of the leaching conditions of pure stibnite in a solution of sodium sulfide and sodium hydroxide at 40 °C. Findings from the surface response method revealed that the ideal concentrations maximizing antimony recovery (98%–100% Sb) were 1 g Na 2 S and 1 g NaOH per gram of pure stibnite. A
احصل على السعر
This article covers a hydrometallurgical method for processing of a gold-antimony flotation concentrate in alkaline sulfide solutions. Thermodynamic analysis of the reaction stibnite with sulfide sodium and sodium hydroxide was performed. The chemical and phase compositions of the investigated material, mainly represented by compounds of antimony, silicon, calcium,
احصل على السعر
It was observed that the rate of leaching of stibnite: a) increased with an increase in both Na^sub 2^S and NaOH concentration (from 0.5 wt. % to 2.0 wt. %), and temperature (from 292 K to 327 K); b) reached its maximum at Na^sub 2^S:NaOH molar ratio equal to 1:2; c) decreased with an increase in particle size (from 0.04 mm to 0.5 mm) and L/S
احصل على السعر
This paper presents the results of a laboratory investigation of alkaline leaching of stibnite sample, which originated from Pezinok (Slovakia) mine. The leaching media used was aqueous solution containing sodium hydroxide. This research focused on establishing the effect of the following parameters on alkaline leaching: NaOH concentration, temperature of leaching, and grain size
احصل على السعر
This paper presents the results of the laboratory investigation of alkaline leaching of stibnite (Sb2S3) sample, which originated from Pezinok (Slovakia) mine. The leaching media used in this study were aqueous solutions containing sodium hydroxide. Establishing the effect of the following parameters on alkaline leaching: NaOH concentration, temperature of leaching and grain size
احصل على السعر
2022-4-2 As the ash layer built up, diffusion through the ash layer became the rate controlling step. The activation energy for this step was found to be 33.4 kJ/mol. It was also observed that smaller particle size, larger solid to liquid ratio, and higher NaOH solution concentrations resulted in higher concentrations of stibnite in the leach solution.
احصل على السعر
2016-10-1 Leaching of stibnite concentrates by mixed Na 2 S and NaOH solutions was proposed by previous researchers (Raschman and Sminčáková, 2012, Ubaldini et al., 2000). Mahlangu et al., 2006,Mahlangu et al., 2007 have investigated the kinetics and thermodynamics of reductive leaching of stibnite concentrates using metallic iron in a hydrochloric
احصل على السعر
Abstract The kinetics of the reaction between particulate stibnite and mixed Na2S + NaOH solutions were studied. The effects of the concentration of the Na2S and NaOH (from 0.5% to 2.0%), temperature Expand
احصل على السعر
2006-12-15 Laboratory leaching tests of natural stibnite (containing Sb 2 S 3, SiO 2, ZnS and FeS 2) with NaOH or NaOH Na 2 S solution were carried out. Antimony recovery in NaOH leaching was lower than that with Na 2 S NaOH solutions (1:1).
احصل على السعر
2014-10-1 Vegliò and Ubaldini (2001) studied the optimization of the leaching conditions of pure stibnite in a solution of sodium sulfide and sodium hydroxide at 40 °C. Findings from the surface response method revealed that the ideal concentrations maximizing antimony recovery (98%–100% Sb) were 1 g Na 2 S and 1 g NaOH per gram of pure stibnite. A
احصل على السعر
2015-12-27 leaching agents can be used to solubilise Sb from stibnite ores (Sb2S3): mixture of hydrochloric and tartaric acids, mixture of nitric and tartaric acid and hot concentrated sulphuric acid (Havlik et al., 1991; Ubaldini et al., 2000b). Stibnite can be leached by alkaline solutions of Na2S and NaOH (Ubaldini et al., 2000b).
احصل على السعر
The apparent activation energy and apparent order of stibnite reaction with the solution that contained NaOH were determined from experiments as Ea ≈ 40.5 kJ mol–1 and n ≈ 1, respectively. Investigations into the rates of leaching stibnite by NaOH + Na2S solutions, indicated that Ea ≈ 44 kJ mol–1 and the apparent reaction order n ≈
احصل على السعر
منزل